| | Re: Is it more useful to do a genomic or proteomic analysis?
It depends on what you are looking for: genomics are useful to look for familiar (genetic) risk factors or to detect somatic mutations caused by or that lead to cancer. Also, qPCR can tell us if a particular gene (involved with a particular cancer) is being overexpressed.
About proteomics, they focus more on expression, so they are helpful in detection, but more important: right now they are very helpful in treatment thanks to advances in mAb technology.
Like I said, it depends on your goal. Oncology is a wide field of work so you need to focus at some point (one cancer, one protein/gene...).